Assembly structure of electronic card

ABSTRACT

The present invention provides an assembly structure of electronic card comprising two cover bodies. Bent portions are formed at two ends of each of the cover bodies. A plurality of positioning pieces each having an interference piece on the outer surface thereof are extended from one of the bent portions. The other bent portion is bent inwards to form a bent piece with a slot formed at the front end of the bottom face thereof. A hook body is extended from behind the slot and the bottom face of the bent piece. A plurality of connection holes are formed at the boundary between the hook body and the bent piece. Insertion pieces are formed at two sides of the font end of the cover bodies. Two ends of a frame are extended to form clamping arms having positioning grooves for clamping a connector. The two cover bodies sheathe a circuit board up and down. The positioning pieces are retained in the slot and the connection holes to engage the two cover bodies. The insertion pieces are fixedly retained in the positioning grooves to join the frame and the cover bodies together. The present invention has a high degree of joint, and can be assembled by a user himself.

FIELD OF THE INVENTION

[0001] The present invention relates to an electronic card structureand, more particularly, to an improved assembly structure of electroniccard.

BACKGROUND OF THE INVENTION

[0002] Along with continual development of scientific technology,various kinds of electronic products tend to be compact. In order toenhance life's fun and convenience, it is necessary to store variouskinds of data in these portable electronic products. Therefore, manyelectronic cards come into being, to expand various kinds of functionswithin limited space.

[0003] A common electronic card comprises a printed circuit with twocover bodies respectively disposed above and below it. Joining of theupper and lower cover bodies is exploited to install the printed circuitboard therein. A connector soldered to the printed circuit board isdisposed at the front end of the two cover bodies to install theelectronic card on a motherboard. In a prior art electronic card, thejoining of the upper and lower cover bodies is accomplished usingsupersonic wave, thermal glue, or blanket glue. The processing procedureis cumbersome, and the production time is longer so the production costis higher. Furthermore, this kind of design easily lets the joinedposition be held open when an electronic card is bent, hence resultingin damage of the electronic card and reducing shielding effect of theelectronic card.

[0004] Accordingly, the present invention aims to propose an improvedelectronic card structure assembled totally in retaining way.

SUMMARY OF THE INVENTION

[0005] The primary object of the present invention is to propose anelectronic card structure assembled totally in retaining way without theneed of bonding process. The electronic card thus can be easilyassembled by a user himself.

[0006] Another object of the present invention is to propose an assemblystructure of electronic card with good shielding effect so as to havebetter grounding effect.

[0007] Yet another object of the present invention is to propose anassembly structure of electronic card with high degree of joint, whichcan shorten the production time to reduce the cost.

[0008] Yet another object of the present invention is to propose anelectronic card structure, wherein a frame is used only at the frontsection of the electronic card to facilitate collocation and design ofdifferent circuit boards inside the electronic card. Moreover, rearcovers at the rear end of the electronic card can be assembled by a userhimself.

[0009] Still yet another object of the present invention is to proposean electronic card structure capable of using connectors of differenttypes to enhance the compatibility of the electronic card with standardinterfaces.

[0010] Another object of the present invention is to propose anelectronic card structure, which lets a cover body and a rear coverthereof be not easily spread due to twist of the electronic card so asto have a longer lifetime of use.

[0011] According to the present invention, an electronic card comprisestwo cover bodies. Bent portions are formed at two ends of each of thecover bodies. A plurality of first positioning pieces and a secondpositioning piece are extended in order from rear to front on one of thebent portions. First interference pieces are formed on the surfaces ofthe positioning pieces. The other bent portion is bent inwards to form abent piece with a slot formed at the front end of the bottom facethereof. A hook body is extended from behind the slot and the bottomface of the bent piece. A plurality of connection holes corresponding tothe first positioning pieces are formed at the boundary between the hookbody and the bent piece. The two cover bodies thus cover a circuit boardup and down. The first positioning pieces are retained in the connectionholes and the second positioning pieces are retained in the slots tojoin the two cover bodies together. Each of the cover bodies forms afront and a rear extension ends. Insertion pieces are disposed at bothsides of each of the extension ends. Two ends of a frame are extended toform clamping arms having positioning grooves for clamping a connector.Retaining trenches are disposed at two ends of the front sides of tworear covers so that the insertion pieces at the two sides of the frontextension end can pass through the positioning grooves of the frame andthe insertion pieces at the two sides of the rear extension end callpass through the retaining trenches of the rear covers. Therefore, whenthe two cover bodies are joined together, the frame and the rear coverscan be joined at the front and rear ends of the cover bodies,respectively.

[0012] The various objects and advantages of the present invention willbe more readily understood from the following detailed description whenread in conjunction with the appended drawing, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

[0013]FIG. 1 is a perspective view of the present invention;

[0014]FIG. 2 is an exploded perspective view of the present invention;

[0015]FIG. 3 and FIG. 3A are enlarged views of the cover body of thepresent invention;

[0016]FIG. 4 and FIG. 4A are cross-sectional views of FIG. 1 along lineA-A′;

[0017]FIG. 5 and FIG. 5A are cross-sectional views of FIG. 1 along lineB-B′;

[0018]FIG. 6 and FIG. 6A are cross-sectional views of FIG. 1 along lineC-C′;

[0019]FIG. 7, FIG. 7A and FIG. 7B are cross-sectional views of FIG. 1along line D-D′;

[0020]FIG. 8 is an exploded perspective view of the present inventionwith another kind of connector applied;

[0021]FIG. 9 and FIG. 9A are perspective views of FIG. 5 according toanother embodiment of the present invention;

[0022]FIG. 10 and FIG. 10A are perspective views of FIG. 6 according toanother embodiment of the present invention;

[0023]FIGS. 11A and 11B are perspective views of the cover bodyaccording to another embodiment of the present invention; and

[0024]FIG. 12 is a diagram of a rear cover according to anotherembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] As shown in FIGS. 1, 2, 3 and 3A, an electronic card 10 comprisesan upper and a lower cover bodies 12 and 12′. A first bent portion 14and a second bent portion 14′ in the same direction are respectivelyformed at two opposite edges of each of the cover bodies 12 and 12′. Aplurality of first positioning pieces 18 are disposed on the first bentportion 14. A second positioning piece 20 is disposed at the front endof the first bent portion 14. A hole 22 is formed on each of the firstpositioning pieces 18 and the second positioning piece 20. Aninterference piece 24 is extended outwards from the inner top face ofthe hole 22. The second bent portion 16 is bent inwards to form a bentpiece 26. A slot 28 corresponding to the second positioning piece 22 isdisposed at the front end of the bottom face of the bent piece 26. Ahook body 30 is extended from behind the slot 28 and the bottom edge ofthe bent piece 26. A plurality of connection holes 32 corresponding tothe first positioning pieces 18 are formed at the boundary between thehook body 30 and the bent piece 26. The positions of the connectionholes 32 correspond to those of the first positioning pieces 18. A frontextension end 34 is formed at the front end of a main body 13. A firstfront insertion piece 36 and a second front insertion piece 38 arerespectively disposed at two sides of the front extension end 34. Thefirst front insertion piece 36 has a hole 40, and the second frontinsertion piece 38 has a sheet body 42. Two sides of a frame 44 areextended to form L-shaped clamping arms 46 so as to form receivingspaces 48 between the L-shaped clamping arms 46 and two ends at thefront side of the frame 44. The surface of each of the L-shaped clampingarms 46 forms a through positioning groove 50. Connection bodies 52 areextended from two ends of the rear side of the frame 44. Positioning,pieces 56 are disposed at two sides of a connector 54. A plurality ofcontract terminals 58 at the rear side of the connector 56 are solderedto circuit contacts 62 of a circuit board 60.

[0026] A rear extension end 64 is formed at the rear end of the mainbody 13. A first rear insertion piece 66 and a second rear insertionpiece 68 are respectively formed at two opposite sides of the rearextension end 64. The first rear insertion piece 66 has a hole 70, andthe second rear insertion piece 68 has a sheet body 72. Two connectionsheets 74 are formed at the rear end edge of the rear extension end 64.Two rear corers 76 for retaining up and down are also provided. Aplugging piece 78 is extended from the center of the front edge of therear covers 76. Connection pieces 80 are disposed at two sides of thefront end of each of the two rear covers 76. A through retaining trench82 is formed on the surface of the connection piece 80.

[0027] When the present invention is assembled, the two positioninggrooves 50 on the frame 44 are first slipped on the first and secondfront insertion pieces 36 and 38 at two sides of the front extension end34 of the cover body 12 to let the connection bodies 52 at the rear sideof the frame 44 be respectively positioned at the front ends of theinner sides of the two bent portions 14 and 16 of the cover body 12. Thepositioning pieces 56 of the connector 54 are respectively retained inthe two receiving spaces 48 of the frame 44 to let the circuit board 60soldered at the rear end of the connector 54 be received inside thecover body 12. The insertion piece 78 of each of the rear covers 76 isslantingly inserted between the two connection sheets 74 to let the twoconnection sheets 74 abut against the front end of the rear cover 78,thereby retaining the first and second rear insertion pieces 66 and 68in the retaining trenches of the rear covers 76 and pulling flat therear covers 76. Subsequently, as shown in FIG. 4 and FIG. 4A, the firstbent portion 14 and the second bent portion 16 of the cover body 12′ arerespectively stuck on the inside of the second bent portion 16 and theoutside of the first bent portion 14 of the cover body 12. Please alsorefer to FIGS. 5, 5A, 6 and 6A. When the two cover bodies 12 and 12′ areassembled, the first positioning pieces 18 are inserted into theconnection hoes 32 of the other cover body 12′, and the top edge of theinterference pieces 24 are retained at the top edge of the connectionholes 32. Simultaneously, the interference piece 24 on the secondpositioning piece 20 is also retained at the top edge of the slot 28,thereby joining the two cover bodies 12 and 12′ to cover the circuitboard 60 up and down.

[0028] At the same time when the two cover bodies 12 and 12′ are joinedtogether, the first and second front insertion pieces 36 and 38 at twosides of the front extension end 34 of the cover body 12′ respectivelypass through the two positioning grooves 50 of the frame 44 to let theholes 30 of the first front insertion pieces 36 be retained with thesheet bodies 42 of the second front insertion pieces 38, thereby exactlyassembling the frame 44 with the two cover bodies 12 and 12′, as shownin FIGS. 7, 7A and 7B. Moreover, when the two cover bodies 12 and 12′are joined together, the retaining trenches 82 of the two rear covers 76penetrate through each other so that the first and second rear insertionpieces 66 and 68 can be inserted into the retaining trenches 82simultaneously. Through the retaining of the holes 70 and the sheetbodies 72, the retained rear covers 76 and the two cover bodies 12 and12′ can be joined together. The design of the rear covers 76 willfacilitate extraction out and insertion of an electronic card 10, andcan enhance the whole strength of the electronic card 10.

[0029] In the present invention, as shown in FIG. 1, because theconnection holes 32 are disposed inside one of the two bent portions 16of the cover bodies 12 and 12′, the first and second positioning pieces18 and 20 will be positioned inside the cover bodies 12 and 12′ withoutleaving retaining traces. Moreover, when the present invention isassembled, because the connection holes 32 are disposed at the boundarybetween the bent pieces 26 and the hook bodies 30, the positioningpieces can be exactly limited and will not easily slide, hence achievingvery high degree of joint. In addition that the joining procedure usingsupersonic wave, thermal glue, or blanket glue is not required, theassembly is simple, the production time can be shorten, and the cost canbe reduced. Moreover, because of high degree of joint of the two coverbodies 12 and 12′, the electronic card has good shielding effect andthus better grounding effect.

[0030] Because the present invention is retained and assembled by a userhimself, the design of the electronic card 10 can vary according to thedesign or function requirements of the circuit board 60. The electroniccard 10 can thus have more circuit design and expansion space within thelimit of the specification of extension card. Moreover, only a frame 44is disposed at the front end of the electronic card 10 to clamp aconnector 54. Because there is no frame design in the space sheathed bythe two cover bodies 12 and 12′, the internal space of the electroniccard 10 is increased to facilitate collocation and design of differentcircuit boards inside the electronic card. Moreover, because the rearcovers 76 are joined together totally in retaining way, the conventionalprocessing procedure of point welding can be omitted.

[0031] The joining way by retaining of the connector 54 and the frame 44also applies to another type of connector 84. As shown in FIG. 8, fixingprotuberances 86 project sideward from the rear ends of two oppositesides of the connector 84. The fixings protuberances 86 are fixedlyretained in the receiving spaces 48 of the frame 44 to join theconnector 84 and the frame 44 together. In other words, the presentinvention also applies to different types of connectors, henceincreasing compatible interfaces of use of electronic card and lettingthe application range of electronic card be wider.

[0032] The top edge of the slot 28 and the top edge of the connectionhole 32 can be extended downwards to form slanting, pieces 88, as shownin FIGS. 9, 9A, 10 and 10A. When two cover bodies 12 and 12′ areassembled, the interference pieces 24 on the first and secondpositioning pieces 18 and 20 will be stuck with the slanting pieces 88to enhance the degree of joint between the two cover bodies 12 and 12′with the help of the plane contact of the slanting pieces 88 and theinterference pieces 24.

[0033] In addition to the above structure, the two cover bodies of thepresent invention can also be a cover body set shown in FIGS. 11A and11B. The cover body set comprises a first cover body 90 and a secondcover body 92. Two edges of the first cover body 90 are extendeddownwards to form first bent portions 94, each having a plurality offirst positioning pieces 96 thereon. A second positioning piece 98 isdisposed at the front end of the first bent portion 94. Interferencepieces 100 are extended outwards from the surfaces of the first andsecond positioning pieces 96 and 98. Two edges of the second cover body92 are also extended upwards to form second bent portions 102. Thesecond bent portion 102 is bent inwards to form a bent piece 104. A slot106 corresponding to the second positioning piece 98 is disposed at thefront end of the bottom face of the bent piece 104. A hook body 108 isextended from behind the slot 106 and the bottom end of the bent piece104. A plurality of connection holes 110 corresponding to the firstpositioning pieces 96 are formed at the boundary between the hook body108 and the bent piece 104. The first bent portions 94 at two sides ofthe first cover body 90 are stuck inside the second bent portions 102 ofthe second cover body 92, and the first positioning pieces 96 areinserted into the connection holes 110 at two sides of the second coverbody 92 so that the top edge of the interference piece 100 can beretained at the top edge of the connection holes 110. Simultaneously,the interference piece 100 on the second positioning piece 98 can alsobe retained at the top edge of the slot 106, thereby joining the firstand second cover bodies 90 and 92 together up and down. Other structuresof the first and second cover bodies 90 and 92 and their assemblyrelations with a frame and rear covers are the same as above and thuswill not be further described.

[0034] On the other hand, FIG. 12 shows another embodiment of the aboverear cover structure. An extension piece 112 is disposed at theconnection end of rear cover 76 and the cover bodies 12 and 12′. Thereexists a head between the extension piece 112 and the surface of theconnection end. Two gaps 114 are formed between the extension piece 112and the connection end. Positions of the two gaps 114 corresponding tothose of the two connection pieces 74. Two shallow receiving grooves 116are formed at the front edge of the inner surface of the connection endand correspond to the gaps 114. The two connection pieces 74 of the twocover bodies 12 and 12′ are slantingly inserted into the gaps 114 tomatch the connection base points of the cover bodies 12 and 12′ and therear cover 76. The cover bodies 12 and 12′ and the rear cover 76 arebent flat to place the connection pieces 74 in the gaps 114 so as totightly connect the cover bodies 12 and 12′ and the rear cover 76together. In the above structure of the rear cover 76, after theconnection pieces 74 of the cover bodies 12 and 12′ are slantinglyinserted into the gaps 114 and bent flat, rear ends of the cover bodies12 and 12′ will be stuck with the extension piece 112 of the rear cover76. The extension piece 112 can thus provide a support force for thecover bodies 12 and 12′ to let the connection of the cover bodies 12 and12′ and the rear cover 76 be firmer. When the electronic card istwisted, the connection position of the cover bodies 12 and 12′ and therear cover 76 will not be easily spread, thereby lengthening thelifetime of use and enhance the safety of use of the electronic card.

[0035] Although the present invention has been described with referenceto the preferred embodiment thereof, it will be understood that theinvention is not limited to the details thereof. Various substitutionsand modifications have been suggested in the foregoing description, andother will occur to those of ordinary skill in the art. Therefore, allsuch substitutions and modifications are intended to be embraced withinthe scope of the invention as defined in the appended claims.

I claim:
 1. An assembly structure of electronic card, comprising: twocover bodies each being a main body whose two opposite edgesrespectively have a first bent portion and a second bent portion, aplurality of first positioning pieces being extended from said firstbent portion, an interference piece being formed on each of said firstpositioning pieces, said second bent portion being bent inwards to forma bent piece, a hook body being extended from a bottom end of said bentpiece, a plurality of connection holes corresponding to said firstpositioning pieces being disposed at a boundary between said bent pieceand said hook body, a front extension end being formed at a front edgeof said main body, front insertion pieces being disposed at two sides ofsaid front extension end; a circuit board with a plurality of circuitcontacts at least disposed at one end thereof, said two cover bodiescovering said circuit board up and down, said interference pieces ofsaid first positioning pieces being retained with said connection holesto join said two cover bodies together; a frame whose two opposite sidesare extended to form clamping arms to form receiving spaces at two sidesthereof, a through positioning groove being formed on a surface of eachof said clamping arms, said two cover bodies being respectivelypositioned above and below said frame, said two front insertion piecesbeing inserted into said positioning grooves to join said frame withsaid two cover bodies; and a connector connected at one end of saidcircuit board, positioning pieces being disposed at two ends of saidconnector to be retained in said receiving spaces of said frame.
 2. Theassembly structure of electronic card as claimed in claim 1, wherein asecond positioning piece is disposed at a front end of said first bentportion, one of said interference pieces is formed on said secondpositioning piece, a slot corresponding to said second positioning pieceis disposed at a front end of said bent piece of said second bentportion, and said interference piece of said second positioning piece isretained with said slot when said two cover bodies are engaged.
 3. Theassembly structure of electronic card as claimed in claim 1, whereinsaid two front insertion pieces at two sides of said front extension endhave a hole and a sheet body, respectively.
 4. The assembly structure ofelectronic card as claimed in claim 1, wherein a rear extension end isformed at a rear end of said main body, rear insertion pieces aredisposed at two sides of said rear extension end, two rear coversretaining each other up and down are also provided, connection piecesare disposed at two sides of a front end of each of said rear covers, athrough retaining trench is formed on each of said connection pieces,and said two rear insertion pieces pass through said retaining trenchesto join said two cover bodies with said rear covers.
 5. The assemblystructure of electronic card as claimed in claim 4, wherein said tworear insertion pieces have a hole and a sheet body, respectively.
 6. Theassembly structure of electronic card as claimed in claim 4, wherein twoconnection sheets are disposed at two ends of a rear side of said rearextension end, an insertion piece is extended from a center of a frontedge of each said rear cover, said insertion piece is slantinglyinserted between said two connection sheets and joins said cover bodiesafter being bent flat.
 7. The assembly structure of electronic card asclaimed in claim 4, wherein two extension pieces are disposed at twoends of a rear side of said rear extension end, an extension piece isconnected at a front edge of each of said rear covers, there exists ahead between said extension piece and the surface of said rear cover, atleast two gaps are formed between said extension piece and the frontedge of said rear cover, positions of said gaps correspond to those ofsaid connection pieces, said connection pieces are slantingly insertedinto said gaps to match connection base points of said cover bodies andsaid rear covers so as to connect said cover bodies and said rear coverstogether.
 8. The assembly structure of electronic card as claimed inclaim 7, wherein two receiving grooves are formed at a front edge of aninner surface of said rear cover and correspond to said gaps, and saidreceiving grooves are used to place said connection pieces.
 9. Theassembly structure of electronic card as claimed in claim 1 or 2,wherein slanting pieces are extended from a top edge of each saidconnection holes and a top edge of said slot to let said interferencepiece be stuck with said slanting piece.
 10. A cover body of an assemblystructure of electronic card being a main body whose two opposite edgesrespectively have a first bent portion and a second bent portion, aplurality of first positioning pieces being extended from said firstbent portion, an interference piece being formed on each of said firstpositioning pieces, said second bent portion being bent inwards to forma bent piece, a hook body being extended from a bottom end of said bentpiece, a plurality of connection holes corresponding to said firstpositioning pieces being disposed at a boundary, between said bent pieceand said hook body so that said first positioning pieces can bepositioned in said connection holes.
 11. The cover body of an assemblystructure of electronic card as claimed in claim 10, wherein a secondpositioning piece is disposed at a front end of said first bent portion,one of said interference pieces is formed on said second positioningpiece, and a slot corresponding to said second positioning piece isdisposed at a front end of said bent piece of said second bent portion.12. The cover body of an assembly structure of electronic card asclaimed in claim 10 or 11, wherein slanting pieces are extended from atop edge of each said connection hole and a top edge of said slot. 13.The cover body of an assembly structure of electronic card as claimed inclaim 10, wherein a front extension end is formed at a front edge ofsaid main body, front insertion pieces are disposed at two sides of saidfront extension end, and surfaces of said two front insertion pieceshave a hole and a sheet body, respectively.
 14. The cover body of anassembly structure of electronic card as claimed in claim 10, wherein arear extension end is formed at a rear end of said main body, two rearinsertion pieces are disposed at two sides of said rear extension end,and said two rear insertion pieces have a hole and a sheet body,respectively.
 15. An assembly structure of electronic card, comprising:a first cover body whose two opposite edges have first bent portions, aplurality of first positioning pieces being extended from each of saidfirst bent portions, an interference piece being formed on each of saidfirst positioning pieces, a first front extension end being formed at afront edge of said first cover body, first front insertion pieces beingdisposed at two sides of said first front extension end; a second coverbody whose two opposite edges have second bent portions, said secondbent portion being bent inwards to form a bent piece, a hook body beingextended from a bottom end of said bent piece, a plurality of connectionholes corresponding to said first positioning pieces being disposed at aboundary between said bent piece and said hook body, a second frontextension end being formed at a front edge of said second cover body,second front insertion pieces being disposed at two sides of said secondfront extension end; a circuit board with a plurality of circuitcontacts at least disposed at one end thereof, said first and secondcover bodies covering said circuit board up and down, said interferencepieces of said first positioning pieces being retained with saidconnection holes to join said two cover bodies together; a frame whosetwo opposite sides are extended to form clamping arms to form receivingspaces at two sides of said frame, a through positioning groove beingformed on a surface of each of said clamping arms, said first and secondcover bodies being situated above and below said frame, said first andsecond front insertion pieces passing through said positioning groovesto join said frame with said first and second cover bodies; and aconnector connected at one end of said circuit board, positioning piecesbeing disposed at to ends of said connector to be retained in saidreceiving spaces of said frame.
 16. The assembly structure of electroniccard as claimed in claim 15, wherein a second positioning piece isdisposed at a front end of said first bent portion, one of saidinterference pieces is formed on said second positioning piece, a slotcorresponding to said second positioning piece is disposed at a frontend of said bent piece of said second bent portion, and saidinterference piece of said second positioning piece is retained withsaid slot when said first and second cover bodies are engaged.
 17. Theassembly structure of electronic card as claimed in claim 15, whereinholes are formed on one of said first front insertion pieces and one ofsaid second front insertion pieces, and sheet bodies are extended fromthe other of said first front insertion pieces and the other of saidsecond front insertion pieces.
 18. The assembly structure of electroniccard as claimed in claim 15, wherein a first rear extension end and asecond rear extension end are respectively formed at rear ends of saidfirst and second cover bodies, a first rear insertion piece and a secondrear insertion piece are respectively disposed at two sides of saidfirst and second rear extension ends, two rear covers retaining eachother up and down are also provided, connection pieces are disposed attwo sides of a front end of each of said rear covers, a throughretaining trench is formed on each of said connection pieces, and saidfirst and second rear insertion pieces pass through said retainingtrenches to join said first and second cover bodies with said rearcovers.
 19. The assembly structure of electronic card as claimed inclaim 18, wherein holes are formed on one of said first rear insertionpieces and one of said second rear insertion pieces, and sheet bodiesare extended from the other of said first rear insertion pieces and theother of said second rear insertion pieces.
 20. The assembly structureof electronic card as claimed in claim 18, wherein two connection sheetsare disposed at two ends of a rear side of said rear extension end, aninsertion piece is extended from a center of a front edge of each saidrear cover, said insertion piece is slantingly inserted between said twoconnection sheets and joins said first and second cover bodies afterbeing bent flat.
 21. The assembly structure of electronic card asclaimed in claim 18, wherein two extension pieces are disposed at twoends of a rear side of said rear extension end, an extension piece isconnected at a front edge of each of said rear covers, there exists ahead between said extension piece and the surface of said rear cover, atleast two gaps are formed between said extension piece and the frontedge of said rear cover, positions of said gaps correspond to those ofsaid connection pieces, said connection pieces are slantingly insertedinto said gaps to match connection base points of said cover bodies andsaid rear covers so as to connect said cover bodies and said rear coverstogether.
 22. The assembly structure of electronic card as claimed inclaim 21, wherein two receiving grooves are formed at a front edge of aninner surface of said rear cover and correspond to said gaps, and saidreceiving grooves are used to place said connection pieces.
 23. Theassembly structure of electronic card as claimed in claim 15 or 16,wherein slanting pieces are extended from a top edge of each saidconnection holes and a top edge of said slot to let said interferencepiece be stuck with said slanting piece.
 24. A cover body set of anassembly structure of electronic card, comprising: a first cover bodywhose two opposite edges respectively have first bent portions, aplurality of first positioning pieces being extended from each of saidfirst bent portions, an interference piece being formed on each of saidfirst positioning pieces; and a second cover body whose two oppositeedges respectively have second bent portions, said second bent portionbeing bent inwards to form a bent piece, a hook body being extended froma bottom end of said bent piece, a plurality of connection holescorresponding to said first positioning pieces being disposed at aboundary between said bent piece and said hook body so that said firstpositioning pieces can be positioned in said connection holes.
 25. Thecover body set of an assembly structure of electronic card as claimed inclaim 24, wherein a second positioning piece is disposed at a front endof said first bent portion, one of said interference pieces is formed onsaid second positioning piece, and a slot corresponding to said secondpositioning piece is disposed at a front end of said bent piece of saidsecond bent portion.
 26. The cover body set of an assembly structure ofelectronic card as claimed in claim 24 or 25, wherein slanting piecesare extended from a top edge of each said connection hole and a top edgeof said slot.
 27. The cover body set of an assembly structure ofelectronic card as claimed in claim 24, wherein a front extension end isformed at a front edge of said first and second cover bodies, frontinsertion pieces being disposed at two sides of said front extensionend, and surfaces of said two front insertion pieces have a hole and asheet body, respectively.
 28. The cover body set of an assemblystructure of electronic card as claimed in claim 24, wherein a rearextension end is formed at a front edge of said first and second coverbodies, two rear insertion pieces are disposed at two sides of said rearextension end, and said two rear insertion pieces have a hole and asheet body, respectively.
 29. A rear cover of an assembly structure ofelectronic card, said rear cover being connected with a cover body of anelectronic card, at least two connection pieces being extended from arear end edge of said cover body, said rear cover comprising a main bodywhose connection end has an extension piece, there existing a headbetween said extension piece and the surface of said rear cover, atleast two gaps being formed between said extension piece and the frontedge of said rear cover, positions of said gaps correspond to those ofsaid connection pieces, said connection pieces of said cover body beingslantingly inserted into said gaps to match connection base points ofsaid cover body and said main body so as to connect said cover body andsaid main body together.
 30. The rear cover as claimed in claim 29,wherein two receiving grooves are formed at a front edge of an innersurface of the connection end of said main body and correspond to saidgaps, and said receiving grooves are used to place said connectionpieces.